Seeing tanks like that make me sad for the fish. I had a betta, and I had gotten her a 3 gallon tank which was enough to make her happy.

She had a 1.5 gallon at first but it was too small.

Most of the tanks they make just for betta are 0.5 gallon or even less. While they can survive in small tanks (they can breathe our air unlike other fish) they would be too happy or healthy after awhile.

Young 87 who is enjoying life to the fullest. Retired in 1991 after working 40 years. Lost my husband in 1995. This is a new world for me and I am not a writer. So bear with me, and perhaps in the future I can present something of interest to you.